Home
Advanced Search Map Locator
View Settings
Nurseries Carrying this Plant Add Current Plant To List Edit Current Plant
Show all Photos

Butterflies My Plant Lists Nurseries Planting Guide Contact Calscape About Calscape
Tap map to see plants native to location
Order by Popularity Order by Common Name Order by Scientific Name Order by # of Butterflies Hosted
Show nursery cultivars Hide nursery cultivars
Show plants not in nurseries Hide plants not in nurseries
Grid view Text view
Loading....
San Diego Ceanothus
Ceanothus cyaneus
  
About San Diego Ceanothus (Ceanothus cyaneus) 8 Nurseries Carry This Plant Ceanothus cyaneus is a rare species of flowering shrub known by the common names San Diego Ceanothus and Lakeside Ceanothus. This Ceanothus is found in the mountains of San Diego County, California, and its range probably extends just into Baja California. Most of the remaining natural specimens are in a small area in the hills around Lakeside and Ramona in San Diego County. This is a tall, erect shrub which may approach 5 meters in height. Its spreading branches are gray-green, with the younger twigs a light greenish-brown. The evergreen leaves may be serrated and toothed with hairy knobs, or they may be smooth along the edges. The underside is a lighter green than the upper surface. The flower cluster may exceed 15 centimeters in length, bearing many bunches of flowers along the length of a greenish stalk. The long flowers are bright blue with protruding yellow anthers. The capsule fruits are about 4 millimeters long.

Ceanothus cyaneus can be tricky to grow in landscaping applications. After the first year, direct summer water will usually kill it, but it will often also die if it can't get it's roots to moisture over the summer. It's best to plant on dry rocky slopes near a damper area, such as a seasonal creek, or near an irrigated area, or even 5-10 feet from a bubbler. It does best if surrounded by rocks or other plants that can shade its roots from the sun. If happy, it produces profuse displays of flower ranging from bright blue to powder blue to lavender in color. It does best on north facing slopes, but can also handle east or west facing slopes if there is nearby water.
Plant Description
Plant Type
Plant Type
Shrub

Size
Size
8 - 16.4 ft tall
12 ft wide

Form
Form
Rounded

Growth Rate
Growth Rate
Fast

Dormancy
Dormancy
Evergreen

Fragrance
Fragrance
Fragrant - Pleasant

Flower Color
Flower Color
Blue

Flowering Season
Flowering Season
Winter, Spring

Wildlife Supported
 
Very popular with bees and butterflies. Plants in the Ceanothus genus are host plants to the Spring Azure, Echo Blue, Pacuvius Duskywing, California Tortoiseshell, Pale Swallowtail, and Hedgerow Hairstreak butterflies.

Landscaping Information
Sun
Sun
Full Sun, Part Shade

Moisture
Moisture
Low

Summer Irrigation
Summer Irrigation
Never irrigate once established

Nurseries
Nurseries

Ease of Care
Ease of Care
Moderately Easy

Cold Tolerance
Cold Tolerance
Tolerates cold to 25° F

Soil Drainage
Soil Drainage
Fast

Soil Description
Soil Description
Tolerates clay soil but does best in well drained decomposed granite. Soil PH: 6.0 - 8.0

Common uses
Common uses
Bank Stabilization, Bird Gardens, Butterfly Gardens, Bee Gardens

Companion Plants
Companion Plants
Use with other chaparral plants of southern California such as Manzanitas (Arctostahpylos species), Toyon (Heteromeles arbutifolia), Lemonadeberry (Rhus integrifolia), California Encelia (Encelia californica), Sagebrush (Artemisia californica), California Buckwheat (Eriogonum fasciculatum), Chamise (Adenostem fasciculatum), Bush Rue (Cneoridium dumosum), Tree Poppy (Dendromecon rigida), Thickleaf Yerba Santa (Eriodictyon crassifolium), Flannel Bush (Fremontodendron species), Mallow (Malacothamnus species), Scrub Oak (Quercus berberidifolia), Sages (Salvia species), Dudleya species, cactus species and annuals.

Maintenance
Maintenance
Pruning is recommended to control its tendency toward straggly growth. Prune to desired shape in dry season to prevent infection.

Propagation
Propagation?
For propagating by seed: Hot water; then 3 mos. stratification may improve germination.

Natural Setting
Site Type
Site Type
Dry rocky slopes, foothills and inland valleys among chaparral primarily in the Peninsular Range of San Diego County. At higher elevations, also found in conjunction with pine forest

Climate
Climate
Annual Precipitation: 10.8" - 35.2", Summer Precipitation: 0.31" - 1.82", Coldest Month: 43.4" - 54.6", Hottest Month: 67.1" - 78.5", Humidity: 1.04" - 26.88", Elevation: 339" - 4641"

Alternative Names
Common Names: Lakeside Ceanothus, San Diego Buckbrush


Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora


Sign in to your Calscape Account X




Once signed in, you'll be able to access any previously saved plant lists or create new ones.

Email Address
Password

Sign In